Agent Based Adaptive Multi-constrained Multicast Routing with QoS Guarantees in MANETs

Abstract

Multi-constrained Quality of Service (QoS) routing is to find a feasible path that satisfies multiple constraints simultaneously, which is a big challenge for Mobile Ad hoc Networks (MANETs) where the topology may change constantly. Most of the conventional protocols are designed to concentrate on either maximizing the throughput or decreasing the end-to-end delay. These single constrained QoS routing protocols have inherent shortcomings in real time applications where the communication requires meeting stringent requirements on delay, delay-jitter, cost and other QoS metrics. In this paper we propose an agent based Multi-Constrained QoS aware multicast routing scheme based on MAODV (MC_MAODV) which uses a set of static and mobile agent. It depicts QoS multicast model with multiple constraints which may deal with bandwidth reservation, delay constraint and packet loss to multicast session. Here the mobile agents are used to find multicast routes, create the backbone for a reliable multicasting and to adapt to dynamic topology. Multi-path strategy is introduced to reduce the time consumption of rerouting when the link fails due to node mobility. Also, the source node can utilize the best path for the data transmission to meet multiple QoS requirements. Extensive simulations have been conducted to evaluate the performance of MC_MAODV using Network Simulator (NS-2). The simulation results show that the proposed scheme performs better than traditional MAODV in terms of improving packet delivery ratio and minimizing end-to-end delay.KeywordsMANETsmulti-constrained routing multicastingclustersend-to-end delaypacket loss ratio